Which of the following is the mismatched pair regarding mineral elements and the form in which they are absorbed by plants?

  • A
    Nitrogen $\to NO_3^-$
  • B
    Phosphorus $\to H_2PO_4^-$
  • C
    Sulphur $\to H_2SO_4$
  • D
    Iron $\to Fe^{3+}$

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